Impulse-transmitter.



ZMMIK/ZQ v Q43 E. NBUHOLD.

IMPULSE TRANSMITTER. APPLICATION FILED APB.22, 1910.

Patented Mar. 26, 1,912.

a t/dim. I M/IM UNITED STATES PATENT OFFICE.

QERWIN NETJ'HOLID, OF FRIEDENAU, NEAR BERLIN, GEBIlIANY L SS IGNOB 1'0 THE FIRMA DEUTSC HE'TELEPHONWERKE G. M. B. H'., OF BERLIN, GERMANY.

IMPULSE-TRANSMITTER.

Specification of Letters Patent.

meme Mar. 26,1912.

Application filed mull-2 2, 1910. Seriallo. 567,092.

To all whom z't concern.

Be it known that I, Enwm Nnononmem' gineer, a subject of the King ofHungary, and resident of Friedennu, near Berlin, Gen many, have invented certain new and useful Improvements in Impulse-Transmitters, of which the following is -a,-specification.

This invention. relates to a device for'sending current, thjc operation of .w ich is auto-,

matically determined by the choice of one of several keys. Such current senders are re quired, for example, at the subscribers stutions of automatic telephone exchange systems, where, as so-colled number switches, they serve to produce in the lines number of current impulses corresponding to the number of/the desired subscriber. Switches of this kind are known which are operated by means of a series of holes corresponding to the numbers 1 to Q amid, the finger. being inserted in the corresponding hole and then serving aszi projection to limit the move:

ment of the switch. This Way of working is not without danger since it is not impossible to hurt the finger. Other devices have therefore been proposed which consist essentially of one'or more keys, the lifting of which is v limited by a plug set in oneof a. series of: holes. This method of working fiddling and easily gives rise to errors.

According to the invention the problem is solved by driving the contact device by keys which have a. certain free movement. When used these alter the position of stopssothst the latter limit the motion of scontsct do vice sooner or. later according to the key used and so automatically cause contact to 'be made the desired number of times.

In the drawing one form of construction is. shown, Figure i being a sectional side view,- and Fig. 2 :1 partial front View.

In the casing a: on the base plate y is a frame b, f, g revoluble upon an axis c. The bars 6 of this frame are bent upwerd at the free end t and each there carries on 'pins i, I: a bar twith a finger plate d. This bar has slots in whichthepins z, 76 mloye and is drawn into theupper position by a spring It. The frame itself is normally held in the position. illustrated (the upper p sition) by a sprin 2'. .Upon it is secured at othe are m whic drives the shaft a of thelcem disk 12 through a' pinion n. The cam disk is connected the pinion or .withtheshaft' a by a; running pawl o engaging on'teeth in its -respom'ling revolutionof the disk p 'stopscoiiperatmg with said keys, substan.- f' 105 interior so that it. only turns with the axis 111 the direction aposlte that shown by the arrow. In such turning the cam projections operate upon contact s rings u, 2: through the medium'of a' pivota projection s which, if the com disk should happen to be turned backward, yields so that the springs .u, v are not brou ht into contact.

Now i. a key d is depressed the corresponding bar t first moves down and-in consequence of the'sloping slots moves to' ward thrFi'ight in Fig. 1, so that the spring h is tsnsioned. This motion brings a pro jection r on the bar t7 so'far forward that when the whole frame is depressed 'it strikes upon a step of the strip 6. The frame 6, j, g thus has a. larger or smaller oscillatiouwhich through the toothed drc m produces a corresponding movement ofthe pawl 0 and on the release of the key a 08r- .Il pressing the key farthest italic left-in Fig. 2 the frameis given its g In this casethe springs to, 4; are pressed together by the disk p 10 times sothat. 10 current impulses are sent. The step .9 causes. 9 current impulses. The key correspondin to it moves down simultaneously with the first but in generel does not strike the strip 6. It only trikee-the. strip when. its own finger piecedjs depressed and so its projection. r moved forward. The other keys work in the some way; YWhen the key depressed'is released the movable bar it returns to its position of rest. The making of contact between u and v is caused when thefreme returns, which motion is due to the spring 2 and is retarded by an escapement w.

Having now particularly described and sscertnined the nature-pf my said invention and in what manner the some is to be pen formed, I declare-thdtiwhat I claim is 1. An impulse transmitter of the character described, comprising a movable member; a. contact mechanism to be operated said member, -a plurality of keys for moving said member and adapted to move rela-z etest movement.

tively with respect to it, and a. plurality of tially es and for the purpose set forth. .2, An impulse transmitter of the character described, comprising a movable memher, a ring to be ten'sioned by the moveinent 0 said member into its working posttion ond to return'seid member otter release .s' ,r- Y

into it-s position of rest, a contact mechanism to be operated by said member, a plurality of keys tor moving said member and adapted to move relatively with respect to it, and ei-plurality of stops eoi'iperating with said keys, substantially as and for the purpose set forth.

3.i.An impulse transmitter of the charaeterdeseribed, comprising a movable mem";

.ber, a spring to be tensioned byv the movementofisaid'member into 1ts Working positi'on and to return said-,member after re- 1ease,1nto lts. position of rest a contact mechanism to be operated by said member,

' so as to close its circuit onlyqon the return movement o'zlf saidwmember, a plura-hty of,

keys for; moving.said member and adapted to move relatively with respect to it and a lurality of stops cooperating with said toys, s-ulgsta-ntially as and for .the "purpose .set fortln l.

4.-A-n mpulse tiransmltter'of the character ideserihed, comprising a pn'otall'y mounted irai-ne, a contaet mechanism to be." operated by said frame, a plurality of keys provided on said frame and adapted to move relatively with respect to it, springs to'eounteraotthe relative movement of'said; keys; pro eetlons on said keys and a pluinto its working position and to return said frame into ll'SjjOSltlOIl of rest, a contact meehanism to'be operated loy'said spindle so as to close its eireuitonly on the return IIIOVGITIGHt'Oi said frame, a plurality of keys provided on said frame and adapted tomoye relatively Wlth respect to its springs to counteract the relatire movement of said 5 keys, projections. on said keys and a plurality of stops limiting the movement of saidframe by standing in the way ,of the respectivepnessed'key, substantially as and for the. purpose forth.

In testimony whereof I aflix my signature in preseneeof two witnesses.

t i .ERWIN NEUHOLD. VVitnessesr:

HENRY HAsPnR, ,WOLDEMAR HAUPT. 

